public class Soldier : MonoBehaviour {
    public GameObject grenadePrefab;
    public GameObject target;
    public float throwForce = 10f;
    public float throwRadius = 10f;

    private void Update() {
        // 扔手榴弹
        if (Input.GetKeyDown(KeyCode.Space)) {
            Vector3 targetPosition = CalculateTargetPosition();
            ThrowGrenade(targetPosition);
        }
    }

    private Vector3 CalculateTargetPosition() {
        Collider[] enemies = Physics.OverlapSphere(transform.position, throwRadius, LayerMask.GetMask("Enemy"));
        int maxEnemyCount = 0;
        Vector3 targetPosition = Vector3.zero;

        foreach (Collider enemy in enemies) {
            Collider[] surroundingEnemies = Physics.OverlapSphere(enemy.transform.position, throwRadius, LayerMask.GetMask("Enemy"));
            int count = surroundingEnemies.Length;

            if (count > maxEnemyCount) {
                maxEnemyCount = count;
                targetPosition = enemy.transform.position;
            }
        }

        return targetPosition;
    }

    private void ThrowGrenade(Vector3 targetPosition) {
        GameObject grenade = Instantiate(grenadePrefab, transform.position, Quaternion.identity);
        Rigidbody rb = grenade.GetComponent<Rigidbody>();
        Vector3 throwDirection = (targetPosition - transform.position).normalized;
        rb.AddForce(throwDirection * throwForce, ForceMode.VelocityChange);
    }
}

这里的代码可以参考下。主要利用Physics.OverlapSphere函数来获取范围内的敌方士兵，并计算每个敌方士兵周围的敌方士兵数量。最终选出数量最多的位置作为投掷目标。 代码只是简单的伪代码，可能有问题，你还得自己改下